
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>CSS背景之雪碧图动画</title>
  <style>
    .container{
    }
    .i{
      width: 20px;
      height: 20px;
      background: url(./background.png) no-repeat;
      background-size: 20px 40px;
      transition: background-position .4s;
    }
    .i:hover{
      background-position: 0 -20px;
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="i"></div>
  </div>
</body>
</html>
